The Long-tailed Blue butterfly can be distinguished from Lang's Short-tailed Blue by the broad white streak near
the border of the underside wings.
The Long-tailed Blues above left/centre still have their long tails and "eye-spots" but the faded
one above right has lost its long tail (to a bird or to wear and tear). The tails and eyespots serve as fake antennae and eyes
to deceive predators and let the butterfly escape.
The butterfly is native to (warm) parts of Eurasia and parts of Africa and Australasia.